Based on the laws of electromagnetic induction and the eddy current effect, the detector generates a high-frequency alternating magnetic field through its transmitting coil. When this magnetic field encounters a conductive object (such as metal), it induces eddy currents within the metal. The magnetic field generated by these eddy currents, in turn, affects the magnetic field emitted by the detector, resulting in a change in the overall magnetic field. The receiving coil of the detector senses this magnetic field change and converts it into an electrical signal. After amplification and processing by the control system, an alarm signal is generated, indicating the presence of metal objects.

The JTQ series metal detectors utilize specialized chip-based digital circuit technology, suitable for various industries handling magnetic and non-magnetic bulk materials on conveyor belts. They allow for adjustable ore grades, belt speeds, and mineral types, with digital settings and self-checking functions for easy adjustment and maintenance. The sensitivity adjustment is intelligent, effectively detecting and eliminating metal contaminants, thereby improving product quality and ensuring the safe operation of crushing equipment.